I got a que for all; if anyone can explain

I watched a reel on instagram where a person messaged a couple of people at some time with just a keypad phone. Everyone who was in a 25-meter range got the same massage.

https://www.instagram.com/reel/DEP3F3OJGD_/?utm_source=ig_web_copy_link&igsh=MzRlODBiNWFlZA==Instagram

submitted by /u/Your_moms_satisfier
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from hacking: security in practice https://ift.tt/8ebOBp3